UL Refarming Zero Bufferzone(SRAN10.1_01)

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UL Refarming Zero Bufferzone

Feature Parameter Description

Issue 01

Date 2015-03-23

HUAWEI TECHNOLOGIES CO., LTD.


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Copyright Huawei Technologies Co., Ltd. 2015. All rights reserved.

No part of this document may be reproduced or transmitted in any form or by any means without prior written

consent of Huawei Technologies Co., Ltd.

Trademarks and Permissions

and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.

All other trademarks and trade names mentioned in this document are the property of their respective

holders.

Notice

The purchased products, services and features are stipulated by the contract made between Huawei and the

customer. All or part of the products, services and features described in this document may not be within thepurchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information,

and recommendations in this document are provided "AS IS" without warranties, guarantees or

representations of any kind, either express or implied.

The information in this document is subject to change without notice. Every effort has been made in the

preparation of this document to ensure accuracy of the contents, but all statements, information, and

recommendations in this document do not constitute a warranty of any kind, express or implied.

Huawei Technologies Co., Ltd.

Address: Huawei Industrial Base

Bantian, Longgang

Shenzhen 518129

People's Republic of China

Website: http://www.huawei.com

Email: [email protected]

Issue 01 (2015-03-23) Huawei Proprietary and Confidential

Copyright Huawei Technologies Co., Ltd.

i
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Contents

1 About This Document.................................................................................................................. 1

1.1 Scope.............................................................................................................................................................................. 1

1.2 Intended Audience..........................................................................................................................................................1

1.3 Change History...............................................................................................................................................................1

1.4 Differences Between Base Station Types.......................................................................................................................2

2 Overview......................................................................................................................................... 3

2.1 Background.....................................................................................................................................................................3

2.2 Introduction.................................................................................................................................................................... 3

2.3 Benefits...........................................................................................................................................................................4

3 Technical Description...................................................................................................................5

3.1 Overview........................................................................................................................................................................ 5

3.2 Mitigating mitigate interference of the LTE PUSCH to UMTS.....................................................................................6

3.3 MitigatingInterference of the LTE PUCCH to UMTS.................................................................................................. 8

4 Related Features.............................................................................................................................9

5 Network Impact........................................................................................................................... 11

6 Engineering Guidelines............................................................................................................. 12

6.1 When to Use UL Refarming Zero Bufferzone............................................................................................................. 12

6.2 Required Information................................................................................................................................................... 13

6.3 Network Planning.........................................................................................................................................................15

6.3.1 RF Planning...............................................................................................................................................................15

6.3.2 Network Planning......................................................................................................................................................156.3.3 Hardware Planning.................................................................................................................................................... 15

6.4 Deployment.................................................................................................................................................................. 16

6.4.1 Requirements.............................................................................................................................................................16

6.4.2 Data Preparation..................................................................................................................................................... 16

6.4.3 Precautions.................................................................................................................................................................18

6.4.4 Activation.................................................................................................................................................................. 18

6.4.4.1 Using MML Commands.........................................................................................................................................18

6.4.4.2 MML Command Examples.................................................................................................................................... 18

6.4.4.3 Using the CME.......................................................................................................................................................18

6.4.5 Activation Observation..............................................................................................................................................20

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6.4.6 Deactivation...............................................................................................................................................................20

6.4.6.1 Using MML Commands.........................................................................................................................................20

6.4.6.2 MML Command Examples.................................................................................................................................... 20

6.4.6.3 Using the CME.......................................................................................................................................................20

6.4.7 Reconfiguration......................................................................................................................................................... 21

6.5 Performance Monitoring...............................................................................................................................................21

6.6 Parameter Optimization................................................................................................................................................22

6.7 Troubleshooting............................................................................................................................................................23

7 Parameters.....................................................................................................................................24

8 Counters........................................................................................................................................ 30

9 Glossary.........................................................................................................................................33

10 Reference Documents...............................................................................................................34

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1About This Document

1.1 Scope

This document describes MRFD-101221 UL Refarming Zero Bufferzone (Trial), including its

technical principles, related features, network impact, and engineering guidelines.

NOTE

This document applies only to LTE FDD. Any "LTE" in this document refers to LTE FDD, and

"eNodeB" refers to LTE FDD eNodeBs.

1.2 Intended Audience

This document is intended for personnel who:

l Need to understand the feature described herein

l Work with Huawei products

1.3 Change History

This section provides information about the changes in different document versions. There are

two types of changes:

l Feature change

Changes in features of a specific product version

l Editorial change

Changes in wording or addition of information that was not described in the earlier

version

SRAN10.1 01 (2015-03-23)

This issue does not include any changes.

SRAN10.1 Draft A (2015-01-15)

This is a new document for SRAN10.1.

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1.4 Differences Between Base Station Types

This feature applies only to macro base stations.

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2Overview

2.1 Background

The popularization of intelligent terminals accelerates user migration to next-generation

networks. As traffic loads on UMTS networks lighten, operators can release the spectrums

occupied by UMTS networks and reuse them for LTE networks. This improves spectral

efficiency and data throughput. This is called UMTS and LTE refarming.

In live networks, some areas need more capacity from UMTS networks while the other areas

require more from LTE networks. To ensure capacity and user satisfaction in hotspot areas

with heavy UMTS traffic, spectrum resources occupied by UMTS networks cannot be

released. However, in areas with low UMTS traffic, the spectrums occupied by UMTS

networks can be released for LTE networks. The released spectrums are used for LTE high-end UEs, thereby fulfilling growing LTE capacity requirements.

To cancel the inter-RAT interference in areas covered both by UMTS and LTE networks, the

conventional solution is to plan a buffer zone surrounding hotspot areas. Geographical

isolation is used to reduce the co-channel inter-RAT interference between UMTS and LTE

networks. However, LTE cells in the physical buffer zone cannot use spectrums occupied by

UMTS hotspot areas, which results in significant spectrum waste.

The UL Refarming Zero Bufferzone feature is introduced to eliminate the need of buffer zone

planning in scenarios where deployment requirements of this feature are met, thereby

improving the spectrum efficiency.

2.2 Introduction

The UL Refarming Zero Bufferzone feature optimizes LTE scheduling to mitigate

interference of LTE UEs to UMTS NodeBs and reduce the received total wideband power

(RTWP) of UMTS NodeBs. Moreover, this feature improves spectrum efficiency in specific

scenarios by eliminating the need of planning buffer zones.

The following basic concepts are involved in this document:

l Exclusive spectrum

Exclusive UMTS spectrums can be used only by UMTS networks, while exclusive LTEspectrums can be used only by LTE networks.

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l Shared spectrum

Shared spectrums can be shared between UMTS and LTE networks.

Shared spectrums can be specified by ULSharedFreqStartRBand

ULSharedFreqEndRB. Spectrums between ULSharedFreqStartRBand

ULSharedFreqEndRBare shared spectrums.

l Intra-frequency neighboring UMTS cell

Co-channel interference exists between an LTE cell and its neighboring UMTS cell since

the two cells use some same spectrums in networks. The frequency neighboring UMTS

cell is called the LTE cell's intra-frequency neighboring UMTS cell.

You can run the ADD UTRANNFREQor MOD UTRANNFREQcommand and set

ULSharedFreqIndto Trueto add a frequency to the intra-frequency neighboring UMTS

cell of an LTE cell.

2.3 Benefits

During UL refarming, this feature eliminates the need for buffer zone planning in scenarios

where certain feature deployment requirements are met, thereby reducing the difficulty in UL

refarming. This can accelerate network development to more recent mode and improves

spectrum efficiency.

Assume that an operator has 15 MHz of spectrum resources, which is allocated evenly among

exclusive UMTS spectrums, and exclusive LTE spectrums, and shared UL spectrums. With

this feature, 10 MHz spectrums can be used for LTE networks in pre-planned buffer zones

with 5 MHz for exclusive LTE spectrums and 5 MHz used for shared UL spectrums. In such a

case, in cells where this feature is applied:

l

LTE UEs can use full 10 MHz of spectrum resources for the downlink, nearly doublingthe capacity of original buffer zone deployment, where only 5 MHz of spectrum

resources are available for these LTE UEs.

l Only LTE cell center users (CCUs) can use the entire 10 MHz of spectrum resources.

LTE cell edge users (CEUs) can use only 5 MHz of the exclusive LTE spectrum

resources.

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3Technical Description

3.1 Overview

To ensure a smooth transition from UMTS to LTE, operators can select

AvoidUtranInterfSwitchunder AvoidInterfSwitchto enable the UL Refarming Zero

Bufferzone feature in scenarios where requirements for feature deployment are met. There is

no need to plan buffer zones when this feature is enabled.

To optimize the RTWP and uplink performance of intra-frequency neighboring UMTS cells,

this feature is introduced for LTE UEs to schedule RBs in uplink channels.

l Different RB scheduling schemes are applied to the uplink PUSCH based on the

locations of LTE UEs. For LTE CEUs, only the RB resources on the exclusive LTE spectrums can be

scheduled for the PUSCH because the path loss between these UEs and intra-

frequency neighboring UMTS cells is relatively small.

For LTE CCUs, RB resources on the shared UL spectrums can be preferentially

scheduled for the PUSCH because the path loss between these UEs and intra-

frequency neighboring UMTS cells is relatively large.

Figure 3-1shows how spectrums are allocated for two adjacent base stations, assuming

an operator owns 15 MHz of spectrum resources, among which exclusive LTE, and

UMTS spectrums, and the shared UL spectrums are allocated 5 MHz each.

UMTS networks use shared spectrums for sites (left in the figure) and the UMTS

networks also have 5 MHz exclusive spectrums. Exclusive LTE spectrums are 5MHz.

LTE networks use shared spectrums for sites (right in the figure) and the LTE

networks also have 5 MH exclusive spectrums. Exclusive UMTS spectrums are 5

MHz.

RB resources are allocated to LTE UEs based on their locations, as shown in Figure 3-1.

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Step 1 Check the uplink RB usage rate in an LTE cell.

l If the uplink RB usage rate in the LTE cell is less than or equal to

ULZeroBufZonePRBThd, the RB usage rate is low, and therefore all UEs can only use

RBs on exclusive LTE spectrums.

l If the uplink RB usage rate in the LTE cell is greater thanULZeroBufZonePRBThdforthree consecutive seconds, the RB usage is high. In this case, go to Step 2.

Step 2 Check the location of an LTE UE based on its RSRP.

1. Check the UE's location initially based on the downlink RSRP in the serving cell.

If the RSCP is less than or equal to ULZeroBufZoneRsrpThdminus

ULZeroBufZoneRsrpOffset, the UE is a CEU.

If the RSCP is greater than or equal to ULZeroBufZoneRsrpThd, the UE is a CCU.

If the RSCP falls into the range of the following two: ULZeroBufZoneRsrpThd

minus ULZeroBufZoneRsrpOffset, and ULZeroBufZoneRsrpThd, measurement in

intra-frequency neighboring UMTS cells shall be started. In this case, go to Step 3.

2. If you have initially determined whether the UE is a CEU or CCE in 2.1, check whether

the uplink RB usage rate is less than ULZeroBufZonePRBThdminus

ULZeroBufZonePRBOffset.

If you have, go to Step 1.

If you have not, go to 2.1.

Step 3 Enable the UE to perform measurement in intra-frequency neighboring UMTS cells.

1. Check whether the uplink RB usage rate in the LTE cell is less than

ULZeroBufZonePRBThdminus ULZeroBufZonePRBOffsetfor three consecutive

seconds.

If it is, stop the measurement and go to Step 1.

If it is not, go to 3.2.

2. Check whether the UE's downlink RSRP is greater than the sum of

ULZeroBufZoneRsrpThdand ULZeroBufZoneB1RmvOffsetor less than

ULZeroBufZoneRsrpThdminus the sum of ULZeroBufZoneRsrpOffsetand

ULZeroBufZoneB1RmvOffset.

If it is, stop the measurement and go to Step 2.

If it is not, go to 3.3.

3. Enable the eNodeB to instruct the UE to perform measurement in intra-frequency

neighboring UMTS cells. All the neighboring UMTS cells working on spectrums with

the values being ULSharedFreqInd. Then, you can determine the UE's location based

on the RSCP of a neighboring UMTS cell as follows:

If the measured RSCP of the neighboring UMTS cell is less than

ULZeroBufZoneUtranRscpThd, the UE is a CCU.

If the measured RSCP of the neighboring UMTS cell is greater than or equal to

ULZeroBufZoneUtranRscpThd, the UE is a CEU.

In addition, to better determine the location of UEs 3.3, a user-level timer

ULZeroBufZoInterRatB1Timercan be started to periodically perform Step 3.

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NOTE

Because the downlink RSRP of an LTE UE cannot be obtained in realtime, the downlink RSRP in the

serving cell is estimated based on uplink path loss. Therefore, the actual downlink RSRP can be slightly

different.

RBs are allocated on semi-persistent scheduling and Voice over Internet Protocol (VoIP) services onexclusive LTE spectrums.

3.3 Mitigating Interference of the LTE PUCCH to UMTS

The uplink PUCCH of LTE UEs is at the edge of the spectrum resources, therefore the

interference of the PUCCH to UMTS can only be prevented by using the WRFD-140225

Narrowband Interference Suppression interference feature. The uplink RB scheduling

optimization for the PUSCH does not apply to the LTE PUCCH.

When an LTE UE is located in an LTE cell with weak coverage, the uplink PUCCH's transmit

power is large to ensure good communication. In this case, the WRFD-140225 Narrowband

Interference Suppression interference feature identifies the PUCCH's interference and

suppresses the interference through adaptive filtering, thereby optimizing the uplink RTWP

and improving the uplink quality in UMTS.

NOTE

For details about the WRFD-140225 Narrowband Interference Suppression interference feature, see

Narrowband Interference Suppression interference Feature Parameter Description.

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4Related FeaturesPrerequisite Features

l WRFD-140225 Narrowband Interference Suppression

This feature must be enabled to suppress the interference of the LTE PUCCH to intra-

frequency neighboring UMTS cells.

Mutually Exclusive Features

The UL Refarming Zero Bufferzone feature and features related to Inter-cell interference

coordination (ICIC) are mutually exclusive for two reasons. First, application scenarios for

the two features are different. The UL Refarming Zero Bufferzone feature is applied to mixed

networking with LTE using different bandwidths while the ICIC-related feature requires

continuous LTE coverage with the same frequency and bandwidth. Second, the two featuresgroup LTE RB resources differently. ICIC-related features are list as follows:

l LBFD-00202202 Uplink Static Inter-Cell Interference Coordination

l LOFD-00101402 Uplink Dynamic Inter-Cell Interference Coordination

l LOFD-060201 Adaptive Inter-Cell Interference Coordination

l LAOFD-002001 Static TDM eICIC

This feature is also mutually exclusive with features related to single frequency network

(SFN). This feature cannot determine the location of a UE in an SFN cell because interference

between SFN cells cannot be simply determined based on thresholds related to the level.

SFN-related features are list as follows:

l LOFD-003029 SFN

l LOFD-070205 Adaptive SFN/SDMA

Impacted Features

l This feature affects scheduling-related features.

This feature categorizes UEs into two types: CCUs and CEUs.

When the uplink RB usage rate in an LTE cell is less than or equal to

ULZeroBufZonePRBThd, all the UEs can only use RB resources on the exclusive

LTE spectrums in the uplink.

When the uplink RB usage rate in an LTE cell is greater thanULZeroBufZonePRBThd, CCUs can preferentially use RB resources on the shared

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spectrums while CEUs can only use RB resources on the exclusive LTE spectrums.

This is to improve the uplink spectrum efficiency.

When this feature is enabled, uplink interference randomization automatically becomes

invalid.

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5Network ImpactSystem Capacity

When this feature is used, buffer zone planning is not required between UMTS and LTE

networks. Compared with buffer zone planning, this feature improves the spectrum efficiency

in buffer zone areas and improves their network capacity.

Because certain requirements are imposed on uplink RB scheduling for LTE cells, LTE CEUs

close to intra-frequency neighboring UMTS cells cannot use RB resources on UL shared

spectrums. Though this causes certain loss in uplink LTE capacity compared with the LTE

network with no interference, the downlink LTE capacity is greatly improved with a

maximum of 100% capacity gains.

Network Performance

l Impact on the UMTS system

In scenarios of adjacent UMTS and LTE sites with the same interference, this feature can

optimize the RTWP in UMTS cells, thereby ensuring UMTS uplink performance.

l Impact on the LTE system

After this feature is enabled, different center frequencies occur in LTE networks due to

different bandwidths used by LTE networks and intra-frequency inter-LTE-cell

handovers increase.

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6Engineering Guidelines

6.1 When to Use UL Refarming Zero Bufferzone

This feature is recommended in scenarios with the following conditions met:

l UL refarming is enabled.

l An operator requires continuous spectrums of at least 10 MHz.

l At least 5 MHz shall be exclusive LTE spectrums.

l Inter-site distance is greater than one kilometer.

This feature optimizes RB scheduling based on the difference between UE-serving cell

path loss and UE-neighboring cell path loss. The path loss difference is relatively small

in scenarios with short inter-site distance, which makes the network performancedeteriorate due to inter-RAT interference between UMTS and LTE. Therefore, this

feature is recommended in scenarios with inter-site distance greater than one kilometer

for eliminating the need of UL buffer zone planning.

For details about the recommended spectrum allocation scheme, see Figure 6-1.

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Figure 6-1Recommended spectrum allocation scheme

NOTE

This feature has no special requirements on frequency bands and is supported on the 850 MHz, 900

MHz, 1900 MHz, AWS, and 2100MHz frequency band.

During sports events or other mass gatherings, the uplink spectrum usage rate is much greater

than the downlink spectrum usage rate in LTE networks. In this case, a buffer zone is

recommended for guaranteed users' experience in terms of data uploading.

6.2 Required Information

Table 6-1lists required information before deploying the feature.

Table 6-1Required information before deploying the feature

Information to be collected Function

Spectrum planning in live networks, which

covers exclusive LTE spectrums, shared UL

spectrums, and exclusive UMTS spectrums

Serve as the basis for configuring

ULSharedFreqStartRB,

ULSharedFreqEndRB, and

ULSharedFreqInd

Engineering parameters in live networks,

including the longitude, latitude, and cell

azimuth of each base station

Used for determining which LTE cells shall

be enabled with this feature

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Information to be collected Function

Counters of LTE cells where this feature can

be activated, as listed in Table 6-2

Used for comparing network performance

before and after activating the feature and

for parameter modification.

Table 6-2Performance counters to be collected

CounterID

CounterName

CounterDescription

Remarks

1526728261 L.Thrp.bit

s.DL

Total downlink

traffic volume for

PDCP SDUs in a

cell

Downlink throughput rate= Total

downlink traffic volume for PDCP

SDUs in a cell/Total duration of

downlink data transmission in a cell

1526728262 L.Thrp.Ti

me.DL

Total transmit

duration of

downlink PDCP

SDUs in a cell

1526728259 L.Thrp.bit

s.UL

Total uplink traffic

volume for PDCP

PDUs in a cell

Uplink throughput rate= Total uplink

traffic volume for PDCP PDUs in a cell/

Total transmission duration of uplink

data in a cell1526728260 L.Thrp.Ti

me.UL

Total receive

duration of uplink

PDCP PDUs in acell

1526726740 L.ChMeas

.PRB.DL.

Used.Avg

Average number of

used PDSCH

PRBs

Downlink PRB usage = Average

number of used downlink PRBs/

Number of PRBs on the whole

bandwidth

1526726737 L.ChMeas

.PRB.UL.

Used.Avg

Average number of

used uplink PRBs

Uplink PRB usage = Average number of

used uplink PRBs/Number of PRBs on

the whole bandwidth

1526727378 L.Traffic.

User.Avg

Average number of

users in a cell

Ratio of the number of users using

shared UL spectrums in a cell = Averagenumber of users using shared UL

spectrums in a cell/Average number of

users in a cell

1526737760 L.Traffic.

ULShared

.USER.Av

g

Average number of

users using shared

UL spectrums in a

cell

1526737761 L.ChMeas

.PRB.UL.

ULShared

.Used.Avg

Average number of

uplink used

PUSCH PRBs on

shared UL

spectrums

Usage rate of PRBs on shared UL

spectrums = Number of used PUSCH

uplink PRBs on shared UL spectrums/

Average number of used uplink PRBs

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CounterID

CounterName

CounterDescription

Remarks

1526737745 L.Thrp.bit

s.UL.Freq

share

Uplink PDCP-

layer Traffic

Volume of CCUs

in a Cell Using the

UMTS and LTE

Shared Spectrum

Uplink throughput rate of users using

shared spectrums in a cell = Uplink

PDCP-layer traffic volume of CCUs in a

cell using the UMTS and LTE shared

spectrum/Transmission duration of

uplink PDCP-layer data for users in a

cell using the UMTS and LTE shared

spectrum1526737746 L.Thrp.Ti

me.UL.Fr

eqshare

Transmission

Duration of Uplink

PDCP-layer Data

for CCUs in a Cell

Using the UMTS

and LTE Shared

Spectrum

67199680 VS.MaxR

TWP

Maximum Power

of Totally

Received

Bandwidth for Cell

-

67199617 VS.Mean

RTWP

Mean Power of

Totally Received

Bandwidth for Cell

-

6.3 Network Planning

6.3.1 RF Planning

When planning your network, the following guidelines are recommended:

l Plan the following spectrums in sequence during UL refarming: exclusive LTE

spectrums, shared UL spectrums, and exclusive UMTS spectrums.

l The recommended ratio of shared UL spectrums to exclusive LTE spectrums is no

greater than 2:1 to prevent limitations on uplink resources caused by a large difference

between shared spectrums and exclusive LTE spectrums.l Exclusive LTE spectrums be on the lower frequency band and RB resources occupied by

the PRACH should be on the exclusive LTE spectrums.

6.3.2 Network Planning

This feature turns the network into inter-frequency LTE networking. Therefore, inter-

frequency UMTS and LTE neighboring cell configuration shall be added to LTE and UMTS

networks.

6.3.3 Hardware Planning

This feature can be enabled on macro base stations.

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6.4 Deployment

6.4.1 Requirements

Other Features

For details, see 4 Related Features.

Hardware

None

License

Feature ID FeatureName

LicenseControlItem ID

LicenseControl Item

NE Sales Unit

MRFD-10122

1

UL

Refarmin

g Zero

Bufferzo

ne

LLT1UR

ZB01

UL Refarming

Zero Bufferzone

eNodeB Per eNodeB

Others

None

6.4.2 Data Preparation

ParameterName

Parameter ID

Setting Notes DataSource

Local cell ID LocalCell

Id

Set this parameter based on cells where this

feature is activated.

Network

plan

(negotiati

on not

required)

Interference

avoidance switch

AvoidInte

rfSwitch:

AvoidUtr

anInterfS

witch

Set this parameter to ONfor cells using this

feature.

Network

plan

(negotiati

on not

required)

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ParameterName

Parameter ID

Setting Notes DataSource

UL Shared

Spectrum Start

RB

ULShared

FreqStart

RB

Set this parameter based on live network

spectrum planning.

Network

plan

(negotiati

on not

required)

UL Shared

Spectrum End

RB

ULShared

FreqEnd

RB


spectrum planning.

Network

plan

(negotiati

on not

required)

UL Zero Buffer

Zone Uplink

PRB Threshold

ULZeroB

ufZonePR

BThd

The default value is recommended. User-

defined

UL Zero Buffer

Zone Uplink

PRB Offset

ULZeroB

ufZonePR

BOffset


defined

UL Zero Buffer

Zone Downlink

RSRP Threshold

ULZeroB

ufZoneRs

rpThd


defined

UL Zero Buffer

Zone Downlink

RSRP Offset

ULZeroB

ufZoneRs

rpOffset


defined

UL Zero Buffer

Zone B1 Remove

Offset

ULZeroB

ufZoneB1

RmvOffse

t


defined

UTRAN RSCP

Report Threshold

ULZeroB

ufZoneUt

ranRscpT

hd


defined

UL Zero Buffer

Zone Inter RatB1 Timer

ULZeroB

ufZoInterRatB1Tim

er


defined

UMTS/LTE

Shared

Frequency

Indicator

ULShared

FreqInd


spectrum planning.

Network

plan

(negotiati

on not

required)

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6.4.3 Precautions

You are advised to modify the LTE center frequency and bandwidth during off-peak hours

(for example, early mornings) before enabling this feature if such modifications are required.

Such modifications cause LTE cell resets.

6.4.4 Activation

6.4.4.1 Using MML Commands

Step 1 Run the eNodeB command MOD ULZeroBufferzoneand specify UL Shared SpectrumStart RB, UL Shared Spectrum End RB, UL Zero Buffer Zone Uplink PRB Threshold,

UL Zero Buffer Zone Uplink PRB Offset, UL Zero Buffer Zone Downlink RSRP

Threshold, UL Zero Buffer Zone Downlink RSRP Offset, UL Zero Buffer Zone B1

Remove Offset, UTRAN RSCP Report Threshold, and UL Zero Buffer Zone Inter Rat

B1 Timer.

Step 2 Run the eNodeB MML command ADD UTRANNFREQto configure UMTS/LTE SharedFrequency Indicatorto identify a frequency of an intra-frequency neighboring UMTS cell.

Step 3 Run the eNodeB MML command ADD UTRANNCELLto add an inter-RAT neighboringUMTS cell for LTE.

Step 4 Run the eNodeB MML command MOD CELLALGOSWITCHand set Interferenceavoidance switchto AvoidUtranInterfSwitch(AvoidUtranInterfSwitch) .

----End

6.4.4.2 MML Command Examples//Configuring parameters related to UL Refarming Zero Bufferzone on the eNodeB

MOD ULZeroBufferzone: LocalCellId=1, ULSharedFreqStartRB=25,

ULSharedFreqEndRB=49, ULZeroBufZonePRBThd=25, ULZeroBufZonePRBOffset=5,

ULZeroBufZoneRsrpThd=-70, ULZeroBufZoneRsrpOffset=30, ULZeroBufZoneB1RmvOffset=5,ULZeroBufZoneUtranRscpThd=-90, ULZeroBufZoInterRatB1Timer=30;

//Adding a frequency for an intra-frequency neighboring UMTS cell on the eNodeB

ADD UTRANNFREQ: LocalCellId=1, UtranDlArfcn=10650, ULSharedFreqInd=BOOLEAN_TRUE;

//Adding an inter-RAT neighboring UMTS cell for LTE on the eNodeBADD UTRANNCELL: LocalCellId=10, Mcc="302", Mnc="220", RncId=1164, CellId=4;

//Enabling UL Refarming Zero Bufferzone on the eNodeB

MOD CELLALGOSWITCH: LocalCellId=1, AvoidInterfSwitch=AvoidUtranInterfSwitch-1;

6.4.4.3 Using the CMENOTE

When configuring the UL Refarming Zero Bufferzone feature on the CME, perform a single

configuration first, and then perform a batch modification if required. Configure the parameters of a

single object before a batch modification. Perform a batch modification before logging out of the

parameter setting interface.

Step 1 Configure a single object (such as a cell) on the CME.

Set parameters on the CME according to the operation sequence in the following table. For

instructions on how to perform the CME single configuration, see CME Single Configuration

Operation Guide.

Step 2 (Optional) Modify objects in batches on the CME. (CME batch modification center)

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To modify objects in batches, click on the CME to start the batch modification wizard.

For instructions on how to perform a batch modification through the CME batch modification

center, press F1 while running the wizard interface to obtain online help.

Table 6-3Configuring parameters on the CME

SN MO NE Parameter Name Parameter ID Configurable in CMEBatchModification Center

1 ULZeroBuffer

Zone

eNode

B

UL Shared

Spectrum Start RB

ULSharedFreq

StartRB

Yes

UL Shared

Spectrum End RB

ULSharedFreq

EndRB

Yes

UL Zero Buffer

Zone Uplink PRB

Threshold

ULZeroBufZo

nePRBThd

Yes

UL Zero Buffer

Zone Uplink PRB

Offset

ULZeroBufZo

nePRBOffset

Yes

UL Zero Buffer

Zone Downlink

RSRP Threshold

ULZeroBufZo

neRsrpThd

Yes

UL Zero Buffer

Zone Downlink

RSRP Offset

ULZeroBufZo

neRsrpOffset

Yes

UL Zero Buffer

Zone B1 Remove

Offset

ULZeroBufZo

neB1RmvOffse

t

Yes

UTRAN RSCP

Report Threshold

ULZeroBufZo

neUtranRscpT

hd

Yes

UL Zero BufferZone Inter Rat B1

Timer

ULZeroBufZoInterRatB1Time

r

Yes

2 UTRANNFRE

Q

eNode

B

UMTS/LTE

Shared Frequency

Indicator

ULSharedFreq

Ind

Yes

3 CELLALGOS

WITCH

eNode

B

Interference

avoidance switch

AvoidInterfSwi

tch:

AvoidUtranInt

erfSwitch

Yes

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----End

6.4.5 Activation Observation

You can use either of the following methods for activation observation:

l Starting a RRC_MEAS_RPRT tracing task of Uu signaling Traceon the LMT

Check whether the UE periodically reports the RSCP of UMTS cells (specified by

ULZeroBufZoInterRatB1Timer). If UTRAN measurement results are periodically

reported, this feature is successfully activated.

l Using performance counters

The feature is successfully activated if the uplink PRB usage rate is greater than

ULZeroBufZonePRBThdand none of the values of the following three counters is zero:

L.Traffic.ULShared.USER.Avg

L.ChMeas.PRB.UL.ULShared.Used.Avg

L.Thrp.bits.UL.Freqshare

6.4.6 Deactivation

6.4.6.1 Using MML Commands

Step 1 Run the eNodeB MML command MOD CELLALGOSWITCHand set Interferenceavoidance switchto AvoidUtranInterfSwitch(AvoidUtranInterfSwitch) .

Step 2 Run the eNodeB MML command MOD UTRANNFREQand set UMTS/LTE SharedFrequency Indicatorto BOOLEAN_FALSE(False).

----End

6.4.6.2 MML Command Examples//Disabling UL Refarming Zero Bufferzone on the eNodeB

MOD CELLALGOSWITCH: LocalCellId=1, AvoidInterfSwitch=AvoidUtranInterfSwitch-0;

//Disabling the identification of a frequency used by an intra-frequency

neighboring UMTS cell on the eNodeBMOD UTRANNFREQ: LocalCellId=1, UtranDlArfcn=10650, ULSharedFreqInd=BOOLEAN_FALSE;

6.4.6.3 Using the CMENOTE

When configuring the UL Refarming Zero Bufferzone feature on the CME, perform a single

configuration first, and then perform a batch modification if required. Configure the parameters of a

single object before a batch modification. Perform a batch modification before logging out of the

parameter setting interface.

Step 1 Configure a single object (such as a cell) on the CME.

Set parameters on the CME according to the operation sequence in Table 6-4. For instructions

on how to perform the CME single configuration, see CME Single Configuration Operation

Guide.

Step 2 (Optional) Modify objects in batches on the CME. (CME batch modification center)

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To modify objects in batches, click on the CME to start the batch modification wizard.

For instructions on how to perform a batch modification through the CME batch modification

center, press F1 while running the wizard interface to obtain online help.

Table 6-4Configuring parameters on the CME

SN MO NE ParameterName

Parameter ID Configurable in CMEBatchModification Center

1 CELLALGOSWI

TCH

eNodeB Interfere

nce

avoidanc

e switch

AvoidInterfSwi

tch:

AvoidUtranInt

erfSwitch

Yes

----End

6.4.7 Reconfiguration

None.

6.5 Performance Monitoring

l After this feature is enabled, the uplink and downlink throughput rates in an LTE cellgreatly increase and the RTWP of intra-frequency neighboring UMTS cells stay stable.

Downlink throughput rate = L.Thrp.bits.DL/L.Thrp.Time.DL

Uplink throughput rate = L.Thrp.bits.UL/L.Thrp.Time.UL

RTWP of an intra-frequency neighboring UMTS cell = VS.MeanRTWP

l You can calculate the usage rate of shared UL spectrums and then obtain capacity gains

brought by this feature using the following performance counters:

Uplink throughput rate of CCUs in a cell = Uplink PDCP-layer traffic volume of

CCUs in a cell using the UMTS and LTE shared spectrum

(L.Thrp.bits.UL.Freqshare )/Total uplink traffic volume for PDCP PDUs in a cell

(L.Thrp.bits.UL)Usage rate of PRBs on shared UL spectrums used by CCUs = Number of used

PUSCH uplink PRBs on UL shared spectrums

(L.ChMeas.PRB.UL.ULShared.Used.Avg)/Average number of used uplink PRBs

(L.ChMeas.PRB.UL.Used.Avg)

Ratio of the CCU number to the total user number in a cell using UL Refarming

Zero Bufferzone = Average number of CCUs using UL shared spectrums

(L.Traffic.ULShared.USER.Avg)/Average number of users in a cell

L.Traffic.User.Avg)

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6.6 Parameter Optimization

After this feature is enabled, if the CCU throughput rate, the usage rate of PRBs for CCUs,

and the CCU rate are low, you can adjust parameters listed in Table 6-5for optimization.

Table 6-5Parameter to be tuned

ParameterID

DataSource

Setting Notes

ULZeroBuf

ZoneRsrpTh

d

Network

plan

(negotiatio

n not

required)

A smaller value of this parameter indicates stricter criteria for

determining an LTE CCU. A larger value indicates looser

criteria for determining an LTE CCU.

You can adjust the value to control the number of LTE CCUs

using the uplink PRBs on UL share spectrums.

ULZeroBuf

ZoneRsrpOf

fset

Network

plan

(negotiatio

n not

required)

A smaller value of this parameter indicates looser criteria for

determining an LTE CEU. A larger value indicates stricter

criteria for determining an LTE CEU.

You can adjust the value to control the number of LTE CEUs.

ULZeroBuf

ZoInterRatB

1Timer

Network

plan

(negotiatio

n not

required)

A smaller value of this parameter indicates a shorter period

for an LTE UE to measure intra-frequency neighboring

UMTS cells. While a larger value indicates a longer period

for the LTE UE to measure intra-frequency neighboring

UMTS cells.

You can adjust this value to control the inter-system

measurement period for LTE UEs in different scenarios.

If the RTWP of an intra-frequency neighboring UMTS cell deteriorates, you can adjust

parameters listed in Table 6-6for optimization.

Table 6-6Parameter to be tuned

ParameterID DataSource Setting Notes

ULSharedFr

eqStartRB

Network

plan

(negotiatio

n not

required)

Check whether the parameter configuration is consistent with

frequency planning.

ULSharedFr

eqEndRB

Network

plan

(negotiatio

n not

required)

Check whether the parameter configuration is consistent with

frequency planning.

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ParameterID

DataSource

Setting Notes

ULSharedFr

eqInd

Network

plan

(negotiatio

n not

required)

Check whether the parameter configuration is correct.

ULZeroBuf

ZoneUtranR

scpThd

Network

plan

(negotiatio

n not

required)

A smaller value of this parameter indicates smaller

interference of LTE UEs to UMTS in the uplink and smaller

uplink LTE gains. While a larger value indicates greater

interference of LTE UEs to UMTS in the uplink and greater

uplink LTE gains.

You can adjust the value to control the uplink LTE gains

when inter-site distances or traffic load are different.

ULZeroBuf

ZoInterRatB

1Timer

Network

plan

(negotiatio

n not

required)

A smaller value of this parameter indicates a shorter period

for an LTE UE to measure intra-frequency neighboring

UMTS cells. While a larger value indicates a longer period

for the LTE UE to measure intra-frequency neighboring

UMTS cells.

You can adjust this value to control the inter-system

measurement period for LTE UEs in different scenarios.

6.7 TroubleshootingNone

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7ParametersTable 7-1Parameters

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

ULZero

BufferZ

one

ULShar

edFreqS

tartRB

MOD

ULZER

OBUFF

ERZON

E

LST

ULZER

OBUFFERZON

E

MRFD-

101221

UL

Refarmi

ng Zero

Bufferzo

ne

Meaning: Indicates the start location of resource

blocks (RBs) in UL Refarming Zero Bufferzone.This

parameter applies only to LTE FDD cells.

GUI Value Range: 0~99

Unit: None

Actual Value Range: 0~99

Default Value: 0

ULZero

BufferZ

one

ULShar

edFreqE

ndRB

MOD

ULZER

OBUFF

ERZON

E

LST

ULZER

OBUFF

ERZON

E

MRFD-

101221

UL

Refarmi

ng Zero

Bufferzo

ne

Meaning: Indicates the end location of resource blocks

(RBs) in UL Refarming Zero Bufferzone.This



Unit: None


Default Value: 5

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Description 7 Parameters



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MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

UtranNF

req

ULShar

edFreqI

nd

ADD

UTRAN

NFREQ

MOD

UTRAN

NFREQ

LST

UTRAN

NFREQ

None None Meaning: Indicates whether a UTRAN frequency is a

frequency that can be shared by the UMTS and LTE.

If this parameter value is BOOLEAN_TRUE, the

UTRAN frequency is a frequency that can be shared

by the UMTS and LTE. If this parameter is set to

BOOLEAN_FALSE, the UTRAN frequency is

dedicated to the UMTS.

GUI Value Range: BOOLEAN_FALSE(False),

BOOLEAN_TRUE(True)

Unit: None

Actual Value Range: BOOLEAN_FALSE,

BOOLEAN_TRUEDefault Value: BOOLEAN_FALSE(False)

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MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

CellAlg

oSwitch

AvoidInt

erfSwitc

h

MOD

CELLA

LGOSW

ITCH

LST

CELLA

LGOSW

ITCH

MRFD-

231808

MRFD-

101221

GSM

and LTE

Buffer

Zone

Optimiz

ation(LT

E)

UL

Refarmi

ng Zero

Bufferzo

ne

Meaning:

Indicates whether to enable the function of avoiding

interference from adjacent GERAN cells. If the

AvoidGeranInterfSwitch option is selected, GL

bufferzone optimization is enabled.

Before selecting the switch, pay attention to the

following:

1. The cell bandwidth must be changed to its next

higher standard bandwidth level. For example, the

bandwidth of a 15 MHz cell must be changed to 20

MHz.

2. It is recommended that this option be not selected if

the bandwidth of a cell is 1.4, 3, 5, or 10 MHz.

3. To avoid interference from adjacent GERAN cells

to the PUCCH, the PUCCH flexible configuration

(specified by the PucchFlexCfgSwitch option of the

PucchAlgoSwitch parameter must be enabled.

When the TddAvoidUpPTSInterfSwitch check box

under this parameter is selected, the UpPTS

interference detection and avoidance function is

enabled for LTE TDD cells.

When the AvoidPrachInterfSwitch check box under

this parameter is selected, the PRACH interference

avoidance function is enabled for LTE TDD cells.

When the IntraBandInterfMonitorSwitch:on check

box under this parameter is selected, the in-band

interference monitoring function is enabled for a cell.

When the IntraBandInterfMonitorSwitch:off check

box is selected, the in-band interference monitoring

function is disabled for a cell. This parameter is

invalid for cells established on LBBPc boards. This

parameter applies only to LTE TDD cells.GUI Value Range: AvoidGeranInterfS-

witch(AvoidGeranInterfSwitch), TddAvoidUpPTSIn-

terfSwitch(TddAvoidUpPTSInterfSwitch),

AvoidPrachInterfSwitch(AvoidPrachInterfSwitch),

AvoidUtranInterfSwitch(AvoidUtranInterfSwitch),

IntraBandInterfMonitorSwitch(IntraBandInterfMoni-

torSwitch)

Unit: None

Actual Value Range: AvoidGeranInterfSwitch,

TddAvoidUpPTSInterfSwitch, AvoidPrachInterfS-

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MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

witch, AvoidUtranInterfSwitch, IntraBandInterfMoni-

torSwitch

Default Value: AvoidGeranInterfSwitch:Off,

TddAvoidUpPTSInterfSwitch:Off,

AvoidPrachInterfSwitch:Off, AvoidUtranInterfS-

witch:Off, IntraBandInterfMonitorSwitch:Off

ULZero

BufferZ

one

ULZero

BufZone

PRBThd

MOD

ULZER

OBUFF

ERZON

E

LSTULZER

OBUFF

ERZON

E

MRFD-

101221

UL

Refarmi

ng Zero

Bufferzo

ne

Meaning: Indicates the uplink physical resource block

(PRB) threshold in UL Refarming Zero

Bufferzone.This parameter applies only to LTE FDD

cells.


Unit: %


Default Value: 25

ULZero

BufferZ

one

ULZero

BufZone

RsrpThd

MOD

ULZER

OBUFF

ERZON

E

LST

ULZEROBUFF

ERZON

E

MRFD-

101221

UL

Refarmi

ng Zero

Bufferzo

ne

Meaning: Indicates the reference signal received

power (RSRP) threshold used for UE location

determination in UL Refarming Zero Bufferzone.This


GUI Value Range: -140~-43

Unit: dBm

Actual Value Range: -140~-43

Default Value: -80

ULZero

BufferZ

one

ULZero

BufZone

RsrpOff

set

MOD

ULZER

OBUFF

ERZON

E

LST

ULZER

OBUFF

ERZON

E

MRFD-

101221

UL

Refarmi

ng Zero

Bufferzo

ne

Meaning: Indicates the reference signal received

power (RSRP) offset used for UE location

determination in UL Refarming Zero Bufferzone.This



Unit: dB


Default Value: 20

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MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

ULZero

BufferZ

one

ULZero

BufZone

PRBOff

set

MOD

ULZER

OBUFF

ERZON

E

LST

ULZER

OBUFF

ERZON

E

MRFD-

101221

UL

Refarmi

ng Zero

Bufferzo

ne

Meaning: Indicates the uplink physical resource block

(PRB) offset in UL Refarming Zero Bufferzone.This



Unit: %


Default Value: 5

ULZero

BufferZone

ULZero

BufZoneB1Rmv

Offset

MOD

ULZEROBUFF

ERZON

E

LST

ULZER

OBUFF

ERZON

E

MRFD-

101221

UL

Refarming Zero

Bufferzo

ne

Meaning: Indicates the threshold for stopping inter-

RAT event B1 measurements in UL Refarming ZeroBufferzone.This parameter applies only to LTE FDD

cells.


Unit: dB


Default Value: 5

ULZero

BufferZ

one

ULZero

BufZone

UtranRscpThd

MOD

ULZER

OBUFFERZON

E

LST

ULZER

OBUFF

ERZON

E

MRFD-

101221

UL

Refarmi

ng ZeroBufferzo

ne

Meaning: Indicates the received signal code power

(RSCP) reporting threshold in UL Refarming Zero

Bufferzone.This parameter applies only to LTE FDDcells.

GUI Value Range: -120~-25

Unit: dBm

Actual Value Range: -120~-25

Default Value: -103

ULZero

BufferZ

one

ULZero

BufZoIn

terRatB

1Timer

MOD

ULZER

OBUFF

ERZONE

LST

ULZER

OBUFF

ERZON

E

MRFD-

101221

UL

Refarmi

ng Zero

Bufferzone

Meaning: Indicates the period of inter-RAT event B1

measurements in UL Refarming Zero Bufferzone.This



Unit: s


Default Value: 30

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MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

ULZero

BufferZ

one

LocalCe

llId

LST

ULZER

OBUFF

ERZON

E

MOD

ULZER

OBUFF

ERZON

E

None None Meaning: Indicates the local ID of the cell. It uniquely

identifies a cell within an eNodeB.


Unit: None


Default Value: None

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8CountersTable 8-1Counters

Counter ID Counter Name CounterDescription

Feature ID Feature Name

1526726737 L.ChMeas.PRB.UL

.Used.Avg

Average number of

used uplink PRBs

Multi-mode: None

GSM: None

UMTS: None

LTE:

LBFD-002025

TDLBFD-002025

LOFD-070205

Basic Scheduling

Basic Scheduling

Adaptive SFN/

SDMA

1526726740 L.ChMeas.PRB.DL

.Used.Avg

Average number of

used PDSCH PRBs

Multi-mode: None

GSM: None

UMTS: None

LTE:

LBFD-002025

TDLBFD-002025

LOFD-070205

Basic Scheduling

Basic Scheduling

Adaptive SFN/

SDMA

1526727378 L.Traffic.User.Avg Average number of

users in a cell

Multi-mode: None

GSM: None

UMTS: None

LTE:

LBFD-002007

TDLBFD-002007

RRC Connection

ManagementRRC Connection

Management

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Description 8 Counters



30


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1526728259 L.Thrp.bits.UL Total uplink traffic

volume for PDCP

PDUs in a cell

Multi-mode: None

GSM: NoneUMTS: None

LTE:

LBFD-002008

TDLBFD-002008

LBFD-002025

TDLBFD-002025

Radio Bearer

Management

Radio Bearer

Management

Basic Scheduling

Basic Scheduling

1526728260 L.Thrp.Time.UL Total receive

duration of uplink

PDCP PDUs in a

cell

Multi-mode: None

GSM: None

UMTS: NoneLTE:

LBFD-002008

TDLBFD-002008

LBFD-002025

TDLBFD-002025

Radio Bearer

Management

Radio BearerManagement

Basic Scheduling

Basic Scheduling

1526728261 L.Thrp.bits.DL Total downlink

traffic volume for

PDCP SDUs in a

cell

Multi-mode: None

GSM: None

UMTS: None

LTE:LBFD-002008

TDLBFD-002008

LBFD-002025

TDLBFD-002025

Radio Bearer

Management

Radio Bearer

Management

Basic Scheduling

Basic Scheduling

1526728262 L.Thrp.Time.DL Total transmit

duration of

downlink PDCP

SDUs in a cell

Multi-mode: None

GSM: None

UMTS: None

LTE:

LBFD-002008TDLBFD-002008

LBFD-002025

TDLBFD-002025

Radio Bearer

Management

Radio Bearer

Management

Basic Scheduling

Basic Scheduling

1526737745 L.Thrp.bits.UL.Fre

qshare

Uplink PDCP-layer

traffic volume of

CCUs in a cell

using the UMTS

and LTE shared

spectrum

Multi-mode:

MRFD-101221

GSM: None

UMTS: None

LTE: None

UL Refarming Zero

Bufferzone

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1526737746 L.Thrp.Time.UL.Fr

eqshare

Transmission

duration of uplink

PDCP-layer data

for CCUs in a cell

using the UMTS

and LTE shared

spectrum

Multi-mode:

MRFD-101221

GSM: None

UMTS: None

LTE: None

UL Refarming Zero

Bufferzone

1526737760 L.Traffic.ULShared

.USER.Avg

Average number of

UEs using the

UMTS and LTE

shared spectrum in

a cell

Multi-mode:

MRFD-101221

GSM: None

UMTS: None

LTE: None

UL Refarming Zero

Bufferzone

1526737761 L.ChMeas.PRB.UL

.ULShared.Used.Av

g

Number of used

uplink PRBs on the

PUSCH on the

UMTS and LTE

shared spectrum in

a cell

Multi-mode:

MRFD-101221

GSM: None

UMTS: None

LTE: None

UL Refarming Zero

Bufferzone

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9GlossaryFor the acronyms, abbreviations, terms, and definitions, see Glossary.

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Description 9 Glossary



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10Reference Documents1. Narrowband Interference Suppression Feature Parameter Description

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Description 10 Reference Documents